摘要
采用动态力学分析(DMA)和导电行为同步联测方法,研究了银包空心微珠/甲基乙烯基硅橡胶导电复合材料在准静态微载荷、瞬态微载荷、交变微载荷和温度场下的导电响应行为。并用扫描电镜(SEM)观察了试样的拉伸断面形貌。结果表明,在交变微载荷和温度场作用下,导电复合材料的电阻表现出对拉伸频率的依赖性,并在拉伸频率f=1Hz时呈现出先增大,后减小的峰形变化。在应力松弛(瞬态微载荷)和蠕变(准静态微载荷)过程中,导电复合材料的电阻响应在一定程度上表现出高分子材料力学松弛的粘弹特性,这可能是因为互穿的高分子基体网络和导电填料网络间具有传导性。
Resistance change of silver-coated fly ash cenospheres/methyl vinyl silicone rubber conductive composites were simultaneously measuremented with a dynamic mechanical thermal analyzer（DMA）and a bench-type digital multimeter under quasi-static micro-loading,transient micro-loading,alternating micro-loading and temperature field.The morphologies of the stretching sections of the test pieces were studied with scanning electron microscopy（SEM）.The results showed that,the resistance of the conductive composites depends on the tensile frequency under the alternating micro-load and the temperature field.Especially,the resistance of the composites begins to decrease then to increase with increaing temperature when the tensile frequency is 1Hz.The resistance response of the conductive composites appears viscoelastic propertie with stress relaxation（transient micro-loading）and greep（quasi-static micro-loading）to a certain extent,likes the polymer materials＇ mechanical relaxation behaviors,due to the conductibility between the interpenetrating polymer matrix network and the conductive filler network.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第12期2105-2108,共4页
Journal of Functional Materials
基金
武汉市科技攻关资助项目(200710321090-18)
湖北工业大学博士基金资助项目(200716-1)
关键词
银包空心微珠
甲基乙烯基硅橡胶
导电行为
动态力学性能
silver-coated fly ash cenosphere
methyl vinyl silicone rubber
conductive behavior
dynamic mechanical properties
